As an essential daily oral care product, the smooth texture, stable state, and user experience of toothpaste rely heavily on a key ingredient—humectants. Accounting for 15% to 65% of toothpaste formulations, this core raw material not only determines whether the paste is easy to squeeze and resistant to drying but also plays an indispensable role in product stability and safety. Today, with the improvement of industry standards and technological innovation, toothpaste humectants are evolving toward greater safety, efficiency, and environmental friendliness.
Core Functions: Building the “Stable Framework” of Toothpaste
The role of toothpaste humectants extends far beyond “moisturizing”—they are versatile components that maintain the excellent properties of toothpaste. Firstly, their primary function is to lock in moisture in the paste, preventing water evaporation when exposed to air, avoiding the inconvenience of dry, hard-to-squeeze tube openings, and ensuring a smooth texture with every use. Secondly, they regulate the paste’s rheological properties, facilitating mechanical processing during production while guaranteeing a uniform and delicate texture.
Humectants also excel in adapting to extreme environments: they effectively lower the freezing point of toothpaste, preventing it from freezing and hardening in low temperatures; at the same time, they increase the product’s azeotropic point, ensuring the paste does not separate into water and other components even after freeze-thaw cycles, and remains stable at high temperatures of 50℃. Additionally, high-quality humectants must be free of unpleasant tastes and compatible with other ingredients such as abrasives and fragrances to ensure they do not compromise the user experience.
Mainstream Ingredients: “Golden Combinations” and Natural Choices
Currently, most toothpaste humectants are organic polyols, with glycerin, polyethylene glycol (PEG), and sorbitol being the most widely used. Leveraging their respective advantages, they have become staples in formulations—even forming “golden combinations.”
Glycerin, a classic humectant, boasts strong hygroscopicity and can mix with water in any ratio. It not only delivers excellent moisturizing effects but also is mild and non-irritating, safe for oral mucosa and suitable for long-term use. Polyethylene glycol (PEG) excels at regulating paste consistency and stability; its good water solubility and lubricity make toothpaste easier to apply, while extending the product’s shelf life. When paired with glycerin, it achieves a “1+1>2” synergistic moisturizing effect.
Sorbitol, a naturally derived humectant, has gained popularity in recent years. Sourced from plant extracts, it offers more stable moisturizing performance than glycerin—losing less water in low-humidity environments and absorbing moisture gently in high-humidity conditions. It also has a slight sweetness that improves the toothpaste’s taste and possesses mild antibacterial properties to inhibit microbial growth. Additionally, ingredients like propylene glycol, known for their higher antibacterial activity, are often incorporated into formulations to enhance product functionality.
Industry Standards: Safeguarding Quality and Safety
In the past, the toothpaste humectant market suffered from chaos due to the lack of unified standards. Some enterprises used low-purity raw materials, leading to inconsistent moisturizing effects and even risks of irritating oral mucosa. To regulate market order and protect consumer rights, the national standard GB/T22114-2021 “Glycerin and Polyethylene Glycol as Humectants for Toothpaste” was introduced, serving as a “timely rain” for industry quality control.
This standard sets a “bottom-line requirement” that glycerin purity must not be less than 95%, ensuring moisturizing efficacy while minimizing impurities. It also imposes strict limits on heavy metals (lead, arsenic, cadmium, etc.) and harmful residues (e.g., ethylene oxide) in PEG, building a solid safety barrier from the source. Compared to EU and US standards, China’s standard is more rigorous in overall purity requirements, aligning with domestic industry conditions and providing technical support for the high-quality development of the toothpaste industry. Enterprises implement full-chain control through raw material procurement audits, real-time production monitoring, and comprehensive finished product testing to ensure compliance with standards.
Future Trends: Bio-based and Functional Innovation Leading the Way
As consumers grow more concerned about oral health and natural ingredients, the toothpaste humectant industry is experiencing a wave of technological upgrading and innovation. The rise of bio-based glycerin is a key trend—high-purity glycerin produced via microbial fermentation not only reduces production costs but also aligns with environmental concepts, attracting heavy investment from leading enterprises. Meanwhile, the development of PEG alternatives is advancing to further improve product safety and compatibility.
In terms of functional expansion, researchers are exploring the compounding of humectants with natural ingredients to develop high-end toothpaste with additional benefits such as whitening, anti-sensitivity, and oral mucosa repair. Personalized formulations tailored to the needs of different groups (e.g., children, the elderly) are emerging as a new direction. Furthermore, environmental protection has penetrated the entire industrial chain—from optimized production processes to eco-friendly packaging materials—driving the toothpaste humectant industry toward sustainable development while ensuring functionality and safety.
From maintaining paste stability to leading industry innovation, the development of toothpaste humectants has always centered on the core of “safety, efficiency, and meeting consumer needs.” With continuous technological progress and improved standards, these “invisible heroes” will deliver a better oral care experience for consumers, propelling the oral care industry toward greater standardization and professionalism.